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Backscattering-Induced Dissipative Solitons in Ring Quantum Cascade Lasers.
Lukas Seitner1, Johannes Popp1, Ina Heckelmann2
1TUM School of Computation, Information and Technology, Technical University of Munich (TUM), 85748 Garching, Germany.
Physical Review Letters
|February 9, 2024
Summary
Ring quantum cascade lasers offer ultrastable frequency combs for integrated spectrometers. A small coupling between counterpropagating waves is crucial for stabilizing soliton operation, matching experimental results.
Area of Science:
- Quantum optics
- Semiconductor lasers
Background:
- Ring quantum cascade lasers (QCLs) are gaining attention for frequency comb generation.
- Their potential for integrated spectrometers in mid-infrared and terahertz regions is significant.
Purpose of the Study:
- To investigate the mechanism behind stable soliton operation in ring quantum cascade lasers.
- To validate theoretical models against experimental data.
Main Methods:
- Utilized a self-consistent Maxwell-Bloch model.
- Compared model predictions with experimental observations.
Main Results:
- Demonstrated that distributed backscattering induces coupling between counterpropagating waves.
- Showed this coupling is essential for stabilizing the soliton solution.
- Achieved excellent agreement between the model and experimental data.
Conclusions:
- Distributed backscattering and resulting wave coupling are key to stable soliton formation in ring QCLs.
- This finding advances the development of integrated spectrometers based on QCL technology.
